Quantity Take Off or QTO is a well known project estimating company serving to the contractors, home builders, architects, design- build firms and sub contractor trade. We are providing estimating service since 2002 with a great chronicle of success.

adsense analytic

Categories

Friday, August 4, 2017

7 Basic Tests of Bricks to ensure it’s quality

This construction video tutorial briefly explains
what the most important brick test procedures are generally undertaken in the
construction jobsite.

The details of the tests are given below :-

Compressive Test – It is performed to verify the strength of a brick. Under
this test 5 samples of bricks are chosen randomly and sent them to laboratory
and apply pressure on various bricks through a crushing machine. Now, take the
average of all the results produced. If the averages is similar to 3.5 N/mm2,
the quality of the bricks are good.

Water
absorption Test – Under this test the bricks are selected in completely dry
condition and taken their weight as W1. Then submerge them in water for 24
hours. Again, taken their (wet bricks) weight after 24 hours and named them as
W2. Now find out the average with the following formula :

Water
Absorption % = W2 – W1/W1 x 100

The
recommended absorption rate should be between 15% – 20% for a good quality
brick.

Impact Test – This test ensures the proper bond in a brick so that
it can’t break easily. Under this test few bricks are selected and dropped them
from a height of 1 meter.

If
the bricks are broken, then impact test will come as failed. Contrarily, if
these bricks are not broken, the test result will be considered as passed and
the bricks are considered as good quality bricks.

Dimension Tolerance Test – In this test shape, size and colors of
the bricks are checked. Under this test, 20 bricks are selected and arranged in
a straight line. Then we take a sample of standard brick and tally it’s size,
shape and color with the bricks arranged in a straight line. If they match with
the sample bricks, the bricks should be treated as good quality bricks.

Soundness
Test – In this test two are chosen randomly and hit with each other, if
metallic sound is produced and the bricks remain unbroken then these bricks are
considered as good quality bricks.

Hardness Test – In this test, a metal or other object is used to
put scratches on the bricks. If scratches are not produced, then these bricks
are hard and treated as good quality bricks.

Structure
Test – In this test, a brick is chosen and broken from the middle, if there are
no cracks, holes, impurities found inside the bricks, then the structures are
strong and these bricks are treated as good quality bricks.

To
watch online demonstration, go through the following video tutorial.